Type-writing machine.



No. 761,245. PATENTED MAY 31, 1904. J. MOKERCHAR & R. BEVERIDGE.

TYPE WRITING MACHINE.

APPLICATION FILED NOV. 23, 1901.

N0 MODEL.

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Patented May 31, 1904.

UNITED STnTEs- PATENT OFFICE.

JOHN MOKERCHAR AND ROBERT BEVERIDGE, OF EDINBURGH, SCOTLAND.

TYPE-WRITING MACHINE.

SPECIFICATION forming part of Letters Patent No. 761,245, dated May 31, 1904 Application filed November 23, 1901. Serial N0.83,417. (No model.)

To all whom it may concern:

Be it known that we, JOHN McKnRcHAR, of 9 Lochrin Terrace, and ROBERT BEVERIDGE, of Clarence street, Edinburgh, Scotland, subjects of the King of Great Britain, have invented certain new and useful Improvements in Type -Writing Machines, of which the following is a specification.

This invention relates to that class of typewriting machines in which the writing is produced on top of the platen, so as to be exposed freely to the inspection of the operator.

Our invention comprises certain improvements in the mechanism of such machines, and the improvements are designed with the object of producing a good machine at a moderate price.

The features of novelty constituting the invention are clearly pointed out in the claim at the end of this specification.

The figure in the appended drawing is a vertical section taken through the machine and showing the arrangement of our improve.

ment.

. We have illustrated our improvement in connection with a type-writer in order that its relative arrangement to the respective parts thereof and the operation can be more readily understood. 7

1 is the base-plate of the machine; 2, the spacing-key; 3, thekey-levers; 4, the shiftkey; 6, the type-lever movements; 7, the typelever's; 8, the typeblocks; 9, standards on the base-plate, which support curved steel bars 10, which carry the type-levers and the lazy-tongs mechanism A, one of which is provided for each type-lever.

11 is the pad-table, which is supported by brackets 12, projecting from the standards 9.

13 is the ink-pad lying in its tray; 14, a pivoted center guide; 15, the platen; 16, frictionrollerfortheplaten; 18, scale-bar; 19,grooved slide carrying the marginal stops 21, escapement release-bar; 22, upright brackets at each end of the carriage and carrying the platen and friction-roller; 23, the platen-rotating wheel; 24, compression-spring on the spindle of the platen; 26, thumb-lever for actuating the line-spacing mechanism; 27 the line-spacing ratchet-wheel, and 28 an adjustable stop for the line-spacing mechanism.

We will now proceed to describe more fully the particular features of our invention.

The carriage 29 of the machine, as will be seen, is made of a hollow rectangular or inverted-trough shape and is provided with longitudinal guide-rails 31 at each side, which fit into grooves 30 in bearing rollers 30. There are preferably four rollers 30, two at each side of the carriage, and they are arranged vertically, being held in place by the rails 31 and rails 31. Each guide rail is made with a sharp edge of V shape, which engages with the V-shaped grooves 30 in the rollers 30. The rails 31 are attached to the carriage, while the lower of the rails 31 have extensions 45 at their ends which are slidably rested on the brackets 44 of the base-plate, and they are secured thereto by means of screws 46. These rails 31 are connected together by two cross-plates 32. The upper rails 31 are held in position by short pillars 33, secured-in the bottom rails.

The method of constructing the carriage and mounting it is simple and gives a free movement with rolling friction. The different parts are as far as possible designed so that they can be readily stamped out.

The arrangement for feeding the carriage forward intermittently consists of the rack 34, attached to the inside of the carriage 29.

This rack, which has its teeth on the under side, engages with the fixed pinion-wheel 35 and the loose pinion-wheel 36,mounted on the spindle 41 of the feed-drum 40. This spindle'is carried at each end in the brackets 37 37 supported on the cross-bars 38 38, secured to the cross-plate 32. The drum 40 is a fixture, and the outer end of the spring is se-' cured to the circumferential wall of the drum, while the inner end is attached to the spindle 41, which latter can turn freely in its bearings. When the carriage is pushed back by hand, the rack actuates the pinion 35, which is attached to the spindle 41, and winds up the spring, The pinion 36 is of ordinary construction, as aforesaid, mounted loose on the spindle, and is provided at its front side with a crown of ratchet-teeth 62, with which feeddogs 63 64 on the escapement-lever 42 can be made to engage. The lever is pivoted to the upper end of the sliding lever 42 at 69, and it has a forked rear end which engages with a wire spring 70. Now each depression of a key-lever 3 actuates theuniversal bar 43, pivoted at 43, and forces up the bar 42*, attached to the lower end of the sliding escapementlever 42, with the result that the upper feeddog 63 is moved out of engagement with the ratchet 62, while the lower feed-dog 64 is brought into engagement with the ratchet 62. When the key-lever is released, the springs 7 7 of the universal bar at once retract this bar and pull down the sliding escapement-lever, with the result that the lower feed-dog 64 allows one tooth of the ratchet to escape before it is caught by the upper dog 63. The movement of the ratchet under the action of the spring 40 allows the rack 34 to move one tooth, and thereby shift the carriage the space of a letter in the usual manner.

When the carriage has traveled the desired length, the proper stop 20 strikes against the plate 102 and turns it and the plate 104 to one side, so that if a key is subsequently pressed the pin 108 strikes against the plate 104 and cannot rise, thereby locking the universal bar.

When a marginal release is desired, the

marginal-release key X is pressed downward, whereby lever 100 pulls on wire 101, and the latter pulls on the plate 102 and tilts-the said plate, so that stop 20 can pass under it. The plate 102 is hinged at 103 to a plate 104, supported in bracket 106 on rail 31.

A spring (not shown) brings the plate 104 back to itsold position, so that the pin 108 of the universal bar can rise at the next pres sure on one of the keys.

Having now fully described our invention, what we claim, and desire to secure by Let ters Patent, is

In a type-writing machine, an inverted-U- shaped carriage, outwardly-projecting longitudinal guide-rails secured to the lower portion of each side of said carriage, in combination with bearing-rolls provided with spacedapart grooves in which guide-rails are received, and means for moving said carriage including mechanism arranged in said carriage, substantially as described.

Signed at Glasgow, Scotland, this 16th day of September, 1901.

JOHN MoKERCHAR. ROBERT BEVERIDGE.

Witn esses:

H. D. FITZIATRICK, WILLIAM FLEMING. 

